Mein Problem
imac Intel 20" would not start after power failure.
Meine Reparatur
After opening case, checked power supply output voltages with VOM. Found zero Volts on all pins except 1.21 Vdc on pin 5 and 3.41 Vdc on Pin 9. Saw only LED 1 lit. Replaced power supply, unit operating correctly. I was baffled at first on determining how to get inside the case, was amaze how easy it was after reading guides!
Mein Rat
Quite easy using Ifixit tools and guides. 1. Technique: iMac Intel 20" EMC 2210 Power Supply Output Voltage Test. 2. Installing iMac Intel 20" EMC 2133 and 2210 Power Supply. Also found several videos on web giving step-by-step instructions. Thanks to those who put the guides together, I could not have completed the repairs without the guides.
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